We just released a new weather website using all sorts of awesome web technologies. We use ModestMaps to show tiled, animated radar and satellite data, Raphael.js to show historical averages and record high/lows, and MapQuest's new Nominatim service sitting on top of OpenStreetMap to do location lookups.
We're really proud of this site and would love to hear your feedback and to have try it out:
http://preview.my-cast.com/
Your hourly forecast is nice and clean. Have you considered adding greater detail to the precipitation icons? Percent probability or estimated total QPF? Either way, I think this is an easier presentation than the hourly weather graphs on NWS.
Bottom line, I'll keep checking back to see how things develop.
EDIT: Forgot to add - good job making the map responsive to zooming and panning. That is one thing that drives me nuts with many radar/map implementations.